US2074651A - Brake - Google Patents

Description

March 23, 1937.

D. M. HUFFMAN ET Al.

Filed March 26, 1936 BRAKE 2 Sheets-Sheet l i DfM. HUFFMAN ET AL. 2,074,651 I BRAKE March' 23, 1937.

Filed March 2e, 195e 2 sheets-sheet 2 3 W @www MHuff/nan i atente BRAKE Donald 1W. Huffman and William iF. YFriend.. Keyser, W. Va., assignors oi one-third to .lohn lil. Massie, lr., Edinburg, Wa.

nppiication Marcin ze, i936, sei-iai No. 'frost s claims.

This invention relates to brakes designed pri-r marily for use on motor vehicles utilizing internal v combustion engines. y

It is an object of the invention to utilize vacuumand compression as a means for retarding the movement of the vehicle on down grades, said means being employed when desired, to supplement the usual friction brake.

Another object is to provide a brake of this type which will not over-heat and will not set up anyundesirable vibrations while it is in action.

A further object is to provide a brake which is especially useful in connection with trucks or other heavy vehicles used on mountain roads or wherever steep and dangerous grades are encountered.

With the foregoing and otherobjects in view which will appear as the description proceeds, the v invention consists of certain novel details of construction and combinations of parts hereinafter' more fully described and pointed out in the claims, it being understood that changes may beI made in the construction and arrangement of parts Without departing from the spirit of the invention as claimed.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings Figure 1 is a side elevation showing an internal combustion engine and the present improvements combined therewith.

Figure 2 is an enlarged section through the compression cylinder and showing its relief valve.

Figure 3 is a section through the .connection wbetween the carbureter and the intake manifold,

the valve therein being shown in section.

Figure 4 is a view partly in section and partly in elevation showing the-brake mechanism in 'normal position;

Figure 5 is a similar View showing the brake fully applied.

Figure 6 is an elevation of the yieldable, lost motion connection between the brake pedal and the choke valve.

Referring to the figures by characters of reference A designates an internal combustion engine with Vtlhe usual intake manifold B and exhaust 1 -manifold C. v Interposed between the carbureter D and th'eintake manifold B is a tubular valve casing or sleeve I in which a supplemental or auxiliary valve 2 is mounted to move about a central transverse axis 3. This valve is used in addition to the usuall carbureter control valve. An arm t is located outside of casing l and moves with valve 2.

into a compression cylinder l.

(Cl. 18S-99) An expansion chamber li is located adjacent to and in communication with the exhaust manifold C and extending from this expansion chamber is an exhaust pipe 6 the back end of which opens An outlet is provided in the back end of this cylinder and extending across the cylinder is a partition 9 having a valve seat ill. A valve il has a stem l2 guided in `the back end of cylinder l and a spring i3 which is mounted on this stem and' within a socket lll in the end wall of the cylinder, thrusts against a. nut l5 or the like on stem i2 and serves to hold the valve normally closed against seat lll.

'I'he usual foot pedal of a vehicle brake has been indicated at i6 and has an arm i'l movable therewith for pulling through a rod i8 upon an arm I9 extending from a transverse shaft 20. This pedal is yieldingly supported in the usual manner. Arms 2| carried by this shaft have rods 22 extending to the usual mechanical brakes, not shown.

A lever`23 is fulcrumed adjacent to cylinder l and one armthereof is adapted to swing against rstem i2 to unseat valve li, while the other arm is connected ,by a rod 2t to arm I9.

Pivotally connected to the brake pedal lli at 25 is a thrust member 26 having an intermediate offset portion 2l constituting aV guide ear while another guide ear 28' is formed by oisetting one end of the thrust member. A rod 29 is slidable in these ears and. pivotally connected at one end to the arm t of the valve 2. A collar 30 is secured to ythis rod between the ears and receives thrust fromone end of a coiled spring mounted on the rod, the other end of the spring bearing against ear 2l. Normally the collar 30 is thrust against ear 23 as shown in Figure 6,

When the engine is operating, fuel will be drawn through casing l into manifold B while spent exhaust gases will be discharged into chamber 5 and thence into pipe 6 and cylinder l. Normally the lever 23 holds valve lli open so that the gasescan escape through the outlet To applythe brake, the foot is removed from the accelerator as usual and pedal it is thrust forward a short distance so as to release valve l l for movement toward its seat. sucked into the cylinders of the engine, thus will be forced out Ainto the exhaust manifold C and thence to chamber 5, pipe 6 and cylinder l Where it will be compressed quickly by the rapidly reciprocating engine pistons, the degree of compression depending upon the position of the valve il relative toits seat. Further forward move- Gas and/or air ment of pedal I6 will result in complete closingv of the valve I l and this will be followed by offset 21 pressing against and compressingvspring 3l,

thereby closing' valve 2. Consequently subsequent reciprocations of the engine pistons will create vacuums between them and the Closed valve 2 as well as compression of the air and/or gas already compressed between the pistons and the valve Il.

It has been found in practice that this double retarding action set up by compression and Vacuum or suction, as explained, will enable a vej hicle to be kept under complete control when descending any grade. Therefore the invention is especially useful in those localities where steep grades frequently are encountered.

What is claimed is: 1. I'he combination with an internal combustionA engine having an exhaust manifold and an intake manifold, of mechanical brake mechanism including an operating element, and a vcom pression brake mechanism comprising a compression cylinder communicating with the exhaust pipe and having an outlet, a valve in the cylinder, means connected to the operating eleoutlet of the cylinder.

2. The combination with an internal combustion engine including a carbureter, of mechanical e brake mechanism including an operating element, and compression brake mechanism including a compression cylinder in communication with the exhaust manifold of the engine, a valve in the cylinder, a normally open valve between the intake manifold and the carbureter and separate from the carbureter for controlling the flow of air and/or gas to the engine, means operated/by the said element for holding the cylinder valve open and for releasing said valve, means for closing said cylinder valve when released to shut off the escape of gases from the cylinder, and means operated byy said operating element for effecting a delayed actuation of the air control valve.

3. The combination with an internal combustion engine having a carbureter and intake and exhaust manifolds, of an auxiliary valve for controlling the ilow of air and/or gas to the intake manifold from the carbureter, a compression cylinder communicating with the exhaust manifold and having an outlet, a normally 'open valve in the cylinder for controlling the escape of air or gas through the outlet, a normally restrained spring for closing the cylinder valve, brake mechanism, a foot pedal movable in one direction to actuate said mechanism, and separate means operated by said pedal for releasing'the spring f to close the cylindervalve and thereafter closing the auxiliary valve.

DONALD M. HUFFMAN. WILLIAM F. FRIEND.

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